1 /* 2 * Copyright (c) 1997 - 2001 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <krb5_locl.h> 35 36 RCSID("$Id: rd_rep.c 17890 2006-08-21 09:19:22Z lha $"); 37 38 krb5_error_code KRB5_LIB_FUNCTION 39 krb5_rd_rep(krb5_context context, 40 krb5_auth_context auth_context, 41 const krb5_data *inbuf, 42 krb5_ap_rep_enc_part **repl) 43 { 44 krb5_error_code ret; 45 AP_REP ap_rep; 46 size_t len; 47 krb5_data data; 48 krb5_crypto crypto; 49 50 krb5_data_zero (&data); 51 ret = 0; 52 53 ret = decode_AP_REP(inbuf->data, inbuf->length, &ap_rep, &len); 54 if (ret) 55 return ret; 56 if (ap_rep.pvno != 5) { 57 ret = KRB5KRB_AP_ERR_BADVERSION; 58 krb5_clear_error_string (context); 59 goto out; 60 } 61 if (ap_rep.msg_type != krb_ap_rep) { 62 ret = KRB5KRB_AP_ERR_MSG_TYPE; 63 krb5_clear_error_string (context); 64 goto out; 65 } 66 67 ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto); 68 if (ret) 69 goto out; 70 ret = krb5_decrypt_EncryptedData (context, 71 crypto, 72 KRB5_KU_AP_REQ_ENC_PART, 73 &ap_rep.enc_part, 74 &data); 75 krb5_crypto_destroy(context, crypto); 76 if (ret) 77 goto out; 78 79 *repl = malloc(sizeof(**repl)); 80 if (*repl == NULL) { 81 ret = ENOMEM; 82 krb5_set_error_string (context, "malloc: out of memory"); 83 goto out; 84 } 85 ret = krb5_decode_EncAPRepPart(context, 86 data.data, 87 data.length, 88 *repl, 89 &len); 90 if (ret) 91 return ret; 92 93 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) { 94 if ((*repl)->ctime != auth_context->authenticator->ctime || 95 (*repl)->cusec != auth_context->authenticator->cusec) 96 { 97 krb5_free_ap_rep_enc_part(context, *repl); 98 *repl = NULL; 99 ret = KRB5KRB_AP_ERR_MUT_FAIL; 100 krb5_clear_error_string (context); 101 goto out; 102 } 103 } 104 if ((*repl)->seq_number) 105 krb5_auth_con_setremoteseqnumber(context, auth_context, 106 *((*repl)->seq_number)); 107 if ((*repl)->subkey) 108 krb5_auth_con_setremotesubkey(context, auth_context, (*repl)->subkey); 109 110 out: 111 krb5_data_free (&data); 112 free_AP_REP (&ap_rep); 113 return ret; 114 } 115 116 void KRB5_LIB_FUNCTION 117 krb5_free_ap_rep_enc_part (krb5_context context, 118 krb5_ap_rep_enc_part *val) 119 { 120 if (val) { 121 free_EncAPRepPart (val); 122 free (val); 123 } 124 } 125